In the first part of the level, use the Demolisher’s bombs to destroy the three silver engines. The first is on the left side of the first screen (picture1). The other two are in the next area just before reaching the second part of the level (picture2-3).

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Minikit 2:

With Mr. Incredible, lift the canisters to the left and destroy them (picture4). Then use Frozone to build a wheel and bring up the Minikit (picture5).

Picture 4

Picture 5

Minikit 3:

With Mr. Incredible, destroy the cracked wall on the left (picture6).

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Minikit 4:

In the second part of the level, go to the right and throw a character on the rod with Mr. Incredible (picture7). Note that you can also simply use a flying character like Syndrome to recover the Minikit more easily.

Picture 7

Minikit 5:

Destroy the silver car on the left with a bomb of a Demolisher’s Minion (picture8). Get a small character like Dash through the conduit (picture9). Climb the building to the left and destroy the library (picture10). Finally build the Minikit to get it.

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Minikit 6:

For the next Minikit, you need Russel, a character obtained by doing the family building (Pixar) of the Financial District. Use his skill to track down a manhole (picture11-12). Build the Minikit to get it back.

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Minikit 7:

In the third and last part of the level, you must destroy 5 cages to get this Minikit. The first is below the very beginning (picture13). The second is a little further to the right (picture14).

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The third is just in front of the engine of the machine (picture15). The fourth is in front of the coal reserve (picture16). Finally, the last one is located to the right of the area (picture17).

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Minikit 8:

Next to the coal pool, take control of the Demolisher’s minion behind the glass using the powers of The Hypnotist, then lower the lever (picture18). Build the Minikit to get it back.

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Minikit 9:

Below the coal reserve, use Bing Bong to retrieve the hidden Minikit in the dark (picture19).

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Minikit 10:

For the last Minikit, go to the far right of the zone and pull the clip with Elastigirl (picture20). Then build the Minikit to retrieve it.